I'm surprised that Day isn't used more, honestly. It's a nice concept. I think of it as unisex leaning female. I wish I were more into it, just sound-wise, but I'm not! I love daytime so much, so it's odd for me not to like it.
If
Gay weren't a word meaning gay I'd like it a lot, I think it's very pretty.
Let's see... these are mostly unisex but they tend to lean
Gay - leans female, quite pretty
Ray - leans male with this spelling. I like it, trying to like it more since B likes
RaymondKay - leans female but I like it more on a boy
Jay - leans male. sharp and smart
Fay - female, I like it a lot too
Day - leans female but is kind of boyish
Tay - leans female. not bad, I guess, but very light
May - female, I find it pretty blah
Bay - just sounds big and fat